make flow happy

hammerlab · Mar 3, 2015 · 1729fd7 · 1729fd7
1 parent 6f06995
commit 1729fd7
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Showing 3 changed files with 6 additions and 4 deletions.
diff --git a/lib/underscore.js b/lib/underscore.js
@@ -2,6 +2,6 @@
 
 declare module "underscore" {
   declare function findWhere<T>(list: Array<T>, properties: {}): ?T;
-
+  declare function clone<T>(obj: T): T;
 }
 
diff --git a/src/GenomeTrack.js b/src/GenomeTrack.js
@@ -46,14 +46,16 @@ var NonEmptyGenomeTrack = React.createClass({
         svg = d3.select(div)
                 .append('svg');
 
-    var originalRange, originalScale, dx;
+    var originalRange, originalScale, dx=0;
     var dragstarted = () => {
       d3.event.sourceEvent.stopPropagation();
       dx = 0;
       originalRange = _.clone(this.props.range);
       originalScale = this.getScale();
     };
     var updateRange = () => {
+      if (!originalScale) return;  // can never happen, but Flow don't know.
+      if (!originalRange) return;  // can never happen, but Flow don't know.
       var newStart = originalScale.invert(-dx),
           intStart = Math.round(newStart),
           offsetPx = originalScale(newStart) - originalScale(intStart);

diff --git a/types/types.js b/types/types.js
@@ -1,5 +1,5 @@
 declare class GenomeRange {
   contig: string;
-  start: ?number;
-  stop: ?number;
+  start: number;
+  stop: number;
 }